<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>参数默认值</title>
</head>
<body>
    <script>
        // 1、形参初始值,具有默认值的参数，一般位置要靠后
        function add(a,b,c=10){
            return a + b + c;
        }

        let result = add(1,2);
        console.log(result);

        //2、与解构赋值结合
        function connect({host="127.0.0.1",username,password,port}){
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);
            
        }
        connect({
            username:'root',
            password:'root',
            port:3307
        });
    </script>
</body>
</html>